BRAINERD, MN - SEPTEMBER 17: George Follmer (#7) and Mark Donohue, each in a Porsche 917/10TC, lead Peter Revson (#4) and Francois Cevert (#22) in the Donnybrooke Can-Am race on September 17, 1972 at Brainerd, Minnesota. Francois Cevert won the race. (Photo by Alvis Upitis)